Abstract

A coherent absorption dip in pump-probe experiment performed on a ten layer optically thin quantum dot(QD) structure has been observed. Measurements performed for different wavelengths, polarizations, pulse widths, and temperatures allow assigning the dip to electromagnetically induced transparency (EIT). The EIT scheme is based on coupling of excitons with different spins in asymmetric QDs. Using spectrally narrow pulses, detrimental effect of the inhomogeneous broadening is reduced since only the QDs with transitions resonant with the pulse wavelength are addressed and participate in the EIT. The effect has been observed at temperatures up to .

Received 21 December 2007Accepted 14 January 2008Published online 31 January 2008

Acknowledgments:

This work has been partially financed by the European Commission through the IST Project No. 29283, QPhoton. S.M. is grateful for financial support from Swedish Foundation for Strategic Research (SSF) and Göran Gustafsson Foundation.